Slice the mangos in half around the large seed in the middle. Cross hatch the fruit, scoop it out with a spoon, and put into the bowl of a food processor fitted with a blade.
Add the remaining ingredients to the bowl, and whirl like crazy until smooth. If you don't have a food processor, I'm sure a blender would work fine too.
Chill for several hours before serving, or better yet - chill overnight in the refrigerator.